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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9cf07b8a17ea1c7e22f7d82648d5b68b5188c694b30dd226bdb7c43293d0759c' 
  AND token = 'vS7g/PUFNEjbsb+Q8EZb3Sr6A056deKSnSPherEbmsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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