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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1bdd53bb324e0c5089d4c3aba9d66235d46c216fbf717155942efc8810656ab3' 
  AND token = 'C6PH3JeO3q60kKO4s6MTKDVB57RtNPLfQ7db7iD34BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}