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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b76980c773eea94f2cd1d92a47f0db055bd546765c19a38284e2dfe4ad2e9328' 
  AND token = 'z3Sch1Su9TS1bToK7bYQN2v/ohx/E7/kEK/5My7FTH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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