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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d138747abe6e484802a118841ccf66aad521488d8b608f85e31328416a1eb4e' 
  AND token = 'PQJAjV297jvCxFp8LycDm6Jmnpb0Mt2MYCe0AnDe8Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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