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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b6f3e65cffe3739eec41c236e52095ea7e5e17c8cecfce7876a50d18b9c35331' 
  AND token = 'mavM1/F5YvVw6JVl/4TIaJuOr1e51tAFuz4YPNt80iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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