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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2daa332487c1341fdd3d2f4cc5c4c79af9248d986bcaa2d3277ed064fdbd33ee' 
  AND token = '1T4Ud6LaedJWWToBqlgyMUOqb+NDw9luj5JC3q6KMik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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