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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f34276a18fd6b6b2748d6fd9966e76e30c388f4f2e5bf8693ac9eaf11678fd07' 
  AND token = 'dG1si2UP7BE810c3JV5d1vL1kr4vbPOpRlFT4XyEbXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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