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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '53c2f85fb152da134516e6ad9c0eb53ce1450b5f9243fe8c3924c65fe0b070f2' 
  AND token = 'b7ibW/11xRFGiei4Up+c59OHEM4o4k3ORBQraC2+Q74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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