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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '21f438451ad849e78af1cbc4c64c3de07ecb0ba4c94f5912f26aa7827c5dd670' 
  AND token = 'OeeCS08HRx3cytjI+A7IG/Qc8f9JKZ0xryJuQH9c4DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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