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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '947634028aeadbf2bd4ca149cd4804dde5e83ece1187da7bf9c4d51d6c006881' 
  AND token = '7fiaczAMktct/7sr6qnGGHg6Pfx/5ZsLF3yXSsmiSg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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