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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '394f4d3df814c4bfdd5d3bae0335fc309c30a6c5326e10384c22930e92ec7974' 
  AND token = '66Qa2gJaFy50Ghrhy+viQz0AnAl291u6ZM0DT+QpGlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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