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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b5b11453b79400da7c503237287477ec59c89e86731f2e12f20a210f2a044552' 
  AND token = 'rKLcpmt5M3ohu76Iln4nqSvHg2ReHKkrj+6aX0IkDA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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