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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4c93e93df171239288de843e18d6168c3845aae020a22e261a7a2fd002b4651f' 
  AND token = 'JRPYvXd731laeAH2OtB2mBncf1IOIlDeo63Cv+UK0Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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